There seems to have been back and forth argument between adsense on 404 pages... So my question is what exactly are you supposed to do about 404's and a cms like wordpress that projects the whole thing automatically? If your adsense is built into your template's header, what is the solution?
I dont know about wordpress, but I have all my errors direct back to the homepage on all my sites. That or depending on the site I have it redirect to another site of mine.... But I would think having just adsense ads like a parked domain would be a bad thing. So I dont even mess with it.
I don't see whats wrong with having Adsense on 404 error pages. As long as there is some content, maybe a paragraph or something, then it should be fine.